Roll src/third_party/pdfium/ 3b91290ba..ce8e51e6c (5 commits)

https://pdfium.googlesource.com/pdfium.git/+log/3b91290ba31e..ce8e51e6c444

$ git log 3b91290ba..ce8e51e6c --date=short --no-merges --format='%ad %ae %s'
2017-04-28 rbpotter Fix rotations
2017-04-28 thestig Clean up private methods in CBC_C40Encoder.
2017-04-28 tsepez Remove some more |new|s, part 4.
2017-04-28 thestig Limit recursion in CXML_Parser::ParseElement().
2017-04-28 thestig Disallow CPDF_FormField with deep node trees.

Created with:
  roll-dep src/third_party/pdfium
BUG=713197,716526


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


TBR=dsinclair@chromium.org

Change-Id: I81ccbaaacbb34cc9923714ca87841f2c756d6b3c
Reviewed-on: https://chromium-review.googlesource.com/490699
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#468212}

DEPS

@@ -64,7 +64,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.
-  'pdfium_revision': '3b91290ba31e1d5bd0147f44f9cc723a72b6eb9a',
+  'pdfium_revision': 'ce8e51e6c444f6caaa160bf8b1decd5d7ec84e6f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.